Tart cherry juice for recovery: the dose most athletes get wrong
Tart cherry juice has better evidence behind it than most things in a supplement cupboard, and nearly everyone who takes it still gets it wrong. The research is decent. Most people time it badly, and the dose is usually a fraction of what was studied.
Here's what the trials found, the dose they used, and the one situation where you probably shouldn't take it at all.
What's in it
Montmorency tart cherries are packed with anthocyanins, the pigments that make them red. Anthocyanins are polyphenols with antioxidant and anti-inflammatory activity, and they're the reason tart cherry gets studied while sweet cherry mostly doesn't.
Here's why that matters to athletes. Hard eccentric work, running included, causes muscle damage and an inflammatory response. Some of that inflammation is a signal to adapt. Some of it is plain soreness that slows your next session. Tart cherry seems to cut the second kind more than it gets in the way of the first, though the line between them is blurrier than the marketing suggests.
The marathon study everyone cites
Howatson and colleagues gave marathon runners tart cherry juice concentrate for 5 days before a race and 2 days after, then tracked their recovery.
The cherry group got their isometric strength back faster. Inflammatory markers, including interleukin-6 and C-reactive protein, were lower. So was uric acid, and markers of oxidative damage improved.
That's a real result from a real race, published in the Scandinavian Journal of Medicine and Science in Sports, and it's the study that put tart cherry on the map for endurance athletes.
Bell and colleagues followed up with cycling research using a simulated road race, and found reduced inflammation and oxidative stress under similar loading. Studies since have pointed the same way fairly consistently. The effects are moderate in size.
The dose people get wrong
This is where most athletes lose the benefit.
The studies used either 30ml of tart cherry concentrate twice a day, or roughly 240-480ml of juice twice a day. The concentrate dose works out at something like 90-100 whole cherries per serving.
A splash of cherry juice in a smoothie falls well short of that. A capsule listing 500mg of tart cherry extract only counts if the extract is standardised for anthocyanins and the label tells you how much. Most don't, and that's the whole problem with extract dosing.
The loading protocol matters as much as the amount. Every trial that showed a clear effect started 4-7 days before the hard event and carried on for 2-3 days after. One glass after a session that's already wrecked you is too late to do much.
The sleep angle
This is a separate line of research, and it's worth knowing about.
Tart cherries contain melatonin, and Howatson's group also ran a sleep trial in healthy adults. Supplementing raised blood melatonin and improved total sleep time and sleep efficiency. The effect was modest, around 25 extra minutes of sleep.
On its own, 25 minutes won't change your life. In a race week where you're travelling, sleeping badly and carrying nerves, it's worth having. And sleep does more for recovery than any supplement on this page.
When not to take it
Here's the trade-off nobody selling cherry juice prints on the bottle.
High-dose antioxidants can blunt training adaptation. This is well established for vitamins C and E, where several trials showed reduced mitochondrial adaptations and smaller strength gains when athletes took large doses through a training block. Reactive oxygen species are part of the signal that tells your body to adapt. Damp the signal and you damp the adaptation.
The evidence for polyphenols like tart cherry is weaker and patchier than for vitamins C and E. The mechanism is close enough, though, that caution is the sensible position.
So use tart cherry around competition, packed race blocks, and any period where recovering fast matters more than adapting. Skip it in your heaviest build phase, when you want that adaptive signal. Taking it every day through 11 months of base training probably gets the trade backwards.
Where it fits for a Hyrox athlete
Realistically, there are three windows.
Race week. Start 5 days out and carry on for 2 days after. This protocol has the best support.
Back-to-back competition. Doubles plus singles across a weekend, or two races close together, where you need to function again quickly and there's no adaptation to protect.
Heavy testing weeks. A block of repeated maximal sessions where soreness is holding back the next session.
Outside those, food covers it. Berries, beetroot and a colourful diet give you most of the polyphenols, minus the cost and the adaptation question.
For the structural side of recovery, meaning connective tissue and joint loading, our bovine collagen (£18.99) does a different job on a different timescale. Our wider guide to recovery supplements for Hyrox athletes sets out where each one earns its place.
The summary
Tart cherry juice works best at 30ml of concentrate twice a day, started 5 days before a hard event and continued for 2 days after. It reduces soreness and inflammatory markers, and it helps sleep a little. Save it for racing season, and check that whatever you buy states its anthocyanin content.
Interval puts every dose on the label, because if you can't check a supplement you're guessing. See what we make.